Did much the same about a dozen years back. I 'built' it in the garage during the winter time at night, (COLD for San Diego tandards). That summer on about day 4 of 100 plus daily temps I was doing some weed maintenance when I heard a 'pop' and something hit my face. It was the cap for the dome top. Don't know your temp variations, but, you might want to consider drilling a small 'vent hole' in the bottom of the tank. I had painted mine a redish black, when I went to shove the top back on I saw the body of the tank had deformed a bit from heat expansion. Did not use any glue when I 'built' it. For the fuel delivery hose I used a kids swirley straw, the kind that has several loops in the dtraw.

JJ, not sure whether your being serious or facetious. If it needs more color what color should it be, always open to suggestions. I have enclosed a current picture of the tank showing the top better, Thanks Bill

Recently purchased a USA Alco S4 for my layout. I picked it because it fit in the era that I wish to run (if possible) early 40's + and the S4 was not built then but the S2 was and the only difference between the 2 from what I understand is the type of trucks. Figured most would not know the difference at it is a pretty recognizable engine with cab in the rear like a steam engine. Now I've built a coaling tower, water tank and a sanding house for my steam engines, but didn't have any fuel for my diesel, So being as I only have 1 diesel I didn't figure I needed too big a one. Started with a 1 1/4" pvc reducing slip "T" the branch part is 1/2" pvc, then cut the ends off 2 1 1/4" caps with rounded ends and glued the together. did a little sanding to remove signs of a joint. Also cut the end off a 1/2" cap for the top. Added some styrene strip to simulate hinges, and a train car break wheel for detail. The end of the caps had the brand name of LASCO so I removed the L and now says ASCO which is the name of a large industrial company that is in solenoids and liquid movement. If you remember the European tank car that I turned into lumber company water tank, well I had the upper structure left over with the ladders and for the base I had the tops that had been cut off of aristo craft transmission towers. wound up fitting pretty good. Labeled it with silhouette machine. Whole project cost about $ 5.00 and a couple of afternoons.